flammrock.github.io/FogOfWarSuperExample.html at master · Flammrock/flammrock.github.io · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Fog Of War</title>
    <style>
      html, body {
        margin: 0;
        padding: 0;
        overflow: hidden;
      }
      .info {
        position: fixed;
        z-index: 99999;
        left: 50vw;
        width: 500px;
        bottom: 100px;
        background: rgba(0,0,0,0.7);
        font: 20px Verdana;
        font-style: italic;
        border-radius: 10px;
        padding: 10px;
        color: #fff;
        text-align: center;
        transform: translateX(-50%);
      }
      .error {
        position: fixed;
        top: 50px;
        left: 50px;
        color: #f00;
        font: 14px Verdana;
        background: rgba(0,0,0,0.7);
        border-radius: 10px;
        padding: 10px;
        width: 300px;
        text-align: center;
      }
    </style>
  </head>
  <body style="background:#08f;">

    <div class="info">
      Keep left click and move mouse to move<br />
      Your units follow your mouse<br />
      Press A to add units
    </div>

    <div id="error" style="display: none;" class="error">
      There is already a unit at this location (mouse position), put your mouse elsewhere
    </div>

    <script type="text/javascript">

      var mouse = {x:0,y:0,ax:0,ay:0,isDown:false};

      window.addEventListener('load',function() {

        // Just wait a little
        setTimeout(function () {
          var game = new Game(4000,4000);

          // Enemy Players
          game.addPlayer('#ff5d00',10);
          game.addPlayer('#ff0000',15);

          window.onmousemove = function(event) {
            var rect = game.canvas.getBoundingClientRect();
            mouse.x = event.clientX - rect.left;
            mouse.y = event.clientY - rect.top;

            if (mouse.isDown) {
              game.camera.mx = mouse.x - mouse.ax;
              game.camera.my = mouse.y - mouse.ay;
            }

          }
          window.onmousedown = function(event) {
            var rect = game.canvas.getBoundingClientRect();
            mouse.ax = event.clientX - rect.left;
            mouse.ay = event.clientY - rect.top;
            mouse.isDown = true;
          }
          window.onmouseup = function(event) {
            game.camera.x += game.camera.mx;
            game.camera.y += game.camera.my;
            game.camera.mx = 0;
            game.camera.my = 0;
            mouse.isDown = false;
          }
          window.onwheel = function (event) {
            var wheel = event.wheelDelta < 0 ? -1 : 1;
            var mouse = game.camera.getMouseRelativeCoordinate();
            var oldScale = game.scale;
            var origin = {x:mouse.x / oldScale, y:mouse.y / oldScale};
            var newScale = event.wheelDelta > 0 ? oldScale * 1.05 : oldScale / 1.05;
            if (newScale >= 8) {
                newScale = 8;
            } else if (newScale <= 0.4) {
                newScale = 0.4;
            }
            game.scale = newScale;
            game.camera.x += -(origin.x - mouse.x / newScale) * newScale;
            game.camera.y += -(origin.y - mouse.y / newScale) * newScale;
          }
          window.onkeypress = function(event) {
            if (event.key.toLowerCase() == 'a') {
              var mouse = game.camera.getMouseRelativeCoordinateScale();
              var test = new Unit(game,game.player,-1,-1,{x:mouse.x,y:mouse.y});
              if (!game.isCollide(test)) {
                game.player.add({x:mouse.x,y:mouse.y});
              } else {
                try {
                  clearTimeout(window.errortimeout);
                } catch (e) {}
                document.getElementById('error').style.display = 'block';
                window.errortimeout = setTimeout(function () {
                  document.getElementById('error').style.display = 'none';
                }, 2000);
              }
            }
          }
        }, 500);


      });

      class Unit {

        constructor(game,player,id,gameid,settings) {

          var defaultSettings = {
            x: player.x,
            y: player.y,
            visibility: 100
          };

          settings = settings || defaultSettings;

          this.game = game;
          this.player = player;
          this.id = id;
          this.fogOfWar = this.game.fogOfWar; // on va utiliser la méthode FogOFWar

          this.gameid = gameid;

          this.speed = 2;

          this.x = settings.x || defaultSettings.x;
          this.y = settings.y || defaultSettings.y;
          this.width = 20;
          this.height = 20;

          this.visibility = settings.visibility || defaultSettings.visibility;

        }

        // Une méthode draw
        draw() {

          // Pour l'instant, un simple carré suffira
          var ctx = this.game.ctx;
          ctx.beginPath();
          ctx.rect(this.x-10,this.y-10,20,20);
          ctx.fillStyle = this.player.color;
          ctx.fill();

        }

        // Une méthode Clip
        clip() {
          this.game.ctx.moveTo(this.x,this.y);
          this.game.ctx.arc(this.x,this.y,this.visibility,0,2*Math.PI,false);
        }

        explore() {
          this.fogOfWar.explore(this.x,this.y,this.visibility);
        }

        followMouse() {
          var mouse = this.game.camera.getMouseRelativeCoordinateScale();
          var angle = Math.atan2(mouse.y-this.y,mouse.x-this.x);

          this.move(angle);
        }

        move(angle) {

          var test = {
            x: this.x + this.speed * Math.cos(angle),
            y: this.y + this.speed * Math.sin(angle),
            width: this.width,
            height: this.height,
            gameid: this.gameid
          };


          if (this.game.isCollide(test)) {

            var test = {
              x: this.x + this.speed * Math.cos(angle),
              y: this.y,
              width: this.width,
              height: this.height,
              gameid: this.gameid
            };

            if (this.game.isCollide(test)) {

              var test = {
                x: this.x,
                y: this.y + this.speed * Math.sin(angle),
                width: this.width,
                height: this.height,
                gameid: this.gameid
              };

              if (this.game.isCollide(test)) {
                return;
              }

              this.y += this.speed * Math.sin(angle);

              return;
            }


            this.x += this.speed * Math.cos(angle);

            return;
          }

          this.x += this.speed * Math.cos(angle);
          this.y += this.speed * Math.sin(angle);
        }

        // Une méthode update
        update() {
          this.draw();
        }

      }

      class Player {

        constructor(game,id,color) {

          this.game = game;

          this.color = color;

          var pos = this.game.randomPosition();

          this.x = pos.x;
          this.y = pos.y;

          this.id = id;
          this.gameid = this.game.absolute_id;

          this.id_units = 0;
          this.units = {};

          // On ajoute une unité dès le départ
          this.add();

          // for bot (move randomly)
          this.time = Date.now();
          this.tick = this.game.getRandomIntInclusive(500,2000);
          this.angle = this.game.getRandomIntInclusive(0,360) * Math.PI / 180;

        }

        add(settings) {
          this.units[this.id_units] = new Unit(this.game,this,this.id_units,this.game.absolute_id,settings);
          this.id_units++;
          this.game.absolute_id++;
        }

        update(current) {

          if (!current && Date.now() - this.time > this.tick) {
            this.time = Date.now();
            this.tick = this.game.getRandomIntInclusive(500,2000);
            this.angle = this.game.getRandomIntInclusive(0,360) * Math.PI / 180;
          }

          for (var id in this.units) {
            if (this.units.hasOwnProperty(id)) {
              this.units[id].update();
            }
          }


          var test = [];
          for (var id in this.units) {
            if (this.units.hasOwnProperty(id)) {
              test.push({id:id,x:this.units[id].x,y:this.units[id].y});
            }
          }
          test = test.sort(function(a,b){
            var a_dx = mouse.x-(a.x+a.width/2);
            var a_dy = mouse.y-(a.x+a.height/2);
            var b_dx = mouse.x-(b.x+b.width/2);
            var b_dy = mouse.y-(b.y+b.height/2);
            var dist1 = Math.sqrt(a_dx*a_dx+a_dy*a_dy);
            var dist2 = Math.sqrt(b_dx*b_dx+b_dy*b_dy);
            return dist1-dist2;
          });
          for (var i = 0; i < test.length; i++) {
            if (current) {
              this.units[test[i].id].followMouse();
              this.units[test[i].id].explore();
            } else {
              this.units[test[i].id].move(this.angle);
            }
          }

        }

        clip() {
          this.game.ctx.beginPath();
          for (var id in this.units) {
            if (this.units.hasOwnProperty(id)) {
              this.units[id].clip();
            }
          }
          this.game.ctx.clip();
        }

      }

      class FogOfWar {

        constructor(game) {

          this.game = game; // game est un instancier de la classe Game

          // On créé un simple canvas
          this.canvas = document.createElement('canvas');

          // On fais en sorte qu'il soit de la même taille que le canvas de notre jeu
          this.canvas.width = this.game.width;
          this.canvas.height = this.game.height;

          // On récupère le contexte 2D
          this.ctx = this.canvas.getContext('2d');

          // On colorie le tout en Noir
          this.ctx.fillStyle = '#000000';
          this.ctx.fillRect(0,0,this.canvas.width,this.canvas.height);

          // Et on passe en mode destination-out
          this.ctx.globalCompositeOperation = 'destination-out';

          // On créé un autre canvas pour y stocker les zones d'ombres
          this.shadow = document.createElement('canvas');
          this.shadow.width = this.game.width;
          this.shadow.height = this.game.height;
          this.shadow_ctx = this.shadow.getContext('2d');
          this.shadow_ctx.fillStyle = 'rgba(0,0,0,0.5)';
          this.shadow_ctx.fillRect(0, 0, this.shadow.width, this.shadow.height);

        }

        // Une simple méthode pour explorer le "Fog Of War"
        explore(x,y,radius) {

          // on dessine juste un cercle
          this.ctx.beginPath();
          this.ctx.lineWidth = 0;
          this.ctx.arc(x,y,radius,0,2*Math.PI,false);
          this.ctx.fill();

          // On dessine juste un cercle en mode destination-out
          this.shadow_ctx.save();
          this.shadow_ctx.globalCompositeOperation = 'destination-out';
          this.shadow_ctx.beginPath();
          this.shadow_ctx.arc(x,y,radius,0,2*Math.PI,false);
          this.shadow_ctx.fillStyle = '#000000';
          this.shadow_ctx.fill();
          this.shadow_ctx.restore();

        }

        clearVisibility() {

          // On efface tout
          this.shadow_ctx.clearRect(0,0,this.shadow.width,this.shadow.height);

          // Et On dessine tout en Noir transparent
          this.shadow_ctx.fillStyle = 'rgba(0,0,0,0.5)';
          this.shadow_ctx.fillRect(0,0,this.shadow.width,this.shadow.height);

        }

        // Une fonction update appelé par le jeu
        update() {

          // On dessine d'abord notre masque
          this.game.ctx.drawImage(this.canvas,0,0);

          // Puis on dessine les zones déjà exploré par le joueur
          this.game.ctx.drawImage(this.shadow,0,0);

        }

      }

      class Camera {

        constructor(game) {

          this.game = game;

          this.x = 0;
          this.y = 0;

          this.mx = 0;
          this.my = 0;

        }

        apply(ctx) {
          ctx.setTransform(1,0,0,1,0,0);

          ctx.translate(this.x+this.mx,this.y+this.my);
          ctx.scale(this.game.scale,this.game.scale);
          ctx.translate(-(this.x+this.mx),-(this.y+this.my));

          ctx.translate(this.x+this.mx,this.y+this.my);
        }

        getMouseRelativeCoordinate() {
          var x = mouse.x - (this.x+this.mx);
          var y = mouse.y - (this.y+this.my);
          return {x:x,y:y};
        }

        getMouseRelativeCoordinateScale() {
          var x = (mouse.x - (this.x+this.mx))/this.game.scale;
          var y = (mouse.y - (this.y+this.my))/this.game.scale;
          return {x:x,y:y};
        }

      }

      class Game {

        constructor(width, height) {

          this.width = width;
          this.height = height;

          this.absolute_id = 0;

          this.canvas = document.createElement('canvas');
          this.canvas.width = window.innerWidth;
          this.canvas.height = window.innerHeight;

          this.ctx = this.canvas.getContext('2d');

          document.body.appendChild(this.canvas);

          this.fogOfWar = new FogOfWar(this);

          this.camera = new Camera(this);

          this.player_id = 1;
          this.player = new Player(this,0,'#0000ff');
          this.other_players = {};
          this.camera.x = -this.player.x+window.innerWidth/2;
          this.camera.y = -this.player.y+window.innerHeight/2;

          this.scale = 1;


          this.background = this.generateMap();


          this.update();

        }

        addPlayer(color,nb) {
          this.other_players[this.player_id] = new Player(this,this.player_id,color);
          var test = new Unit(this,this.other_players[this.player_id],0);
          for (var i = 0; i < nb; i++) {
            this.other_players[this.player_id].add({x:this.other_players[this.player_id].x+i*(test.width+1)});
          }
          this.player_id++;
          this.absolute_id++;
        }

        update() {

          var _this = this;

          // Resize
          this.canvas.width = window.innerWidth;
          this.canvas.height = window.innerHeight;

          // Clear
          this.ctx.clearRect(0,0,this.canvas.width,this.canvas.height);

          this.camera.apply(this.ctx);

          // Draw background
          this.ctx.drawImage(this.background,0,0);

          // Clear Visibility
          this.fogOfWar.clearVisibility();

          // Update the Current Player
          this.player.update(true);

          // Update the fogOfWar
          this.fogOfWar.update();

          this.ctx.save();

          // Clip Visibility Zone
          this.player.clip();

          // Draw Ennemies
          for (var id in this.other_players) {
            if (this.other_players.hasOwnProperty(id)) {
              this.other_players[id].update();
            }
          }

          this.ctx.restore();

          window.requestAnimationFrame(function(){_this.update()});

        }

        getRandomIntInclusive(min, max) {
          min = Math.ceil(min);
          max = Math.floor(max);
          return Math.floor(Math.random() * (max - min +1)) + min;
        }

        randomPosition() {
          return {
            x: this.getRandomIntInclusive(0,this.width),
            y: this.getRandomIntInclusive(0,this.height)
          };
        }

        rectangleIsCollide(rect1,rect2) {
          return (rect1.x < rect2.x + rect2.width &&
            rect1.x + rect1.width > rect2.x &&
            rect1.y < rect2.y + rect2.height &&
            rect1.height + rect1.y > rect2.y);
        }

        isCollide(unit) {

          if (unit.x-unit.width/2 < 0) return true;
          if (unit.y-unit.height/2 < 0) return true;
          if (unit.x+unit.width/2 > this.width) return true;
          if (unit.y+unit.height/2 > this.height) return true;

          for (var id in this.player.units) {
            if (this.player.units.hasOwnProperty(id)) {
              if (unit.gameid!=this.player.units[id].gameid) {
                if (this.rectangleIsCollide(unit,this.player.units[id])) {
                  return true;
                }
              }
            }
          }

          for (var id in this.other_players) {
            if (this.other_players.hasOwnProperty(id)) {
              for (var idunit in this.other_players[id].units) {
                if (this.other_players[id].units.hasOwnProperty(idunit)) {
                  if (unit.gameid!=this.other_players[id].units[idunit].gameid) {
                    if (this.rectangleIsCollide(unit,this.other_players[id].units[idunit])) {
                      return true;
                    }
                  }
                }
              }
            }
          }

          return false;

        }

        generateMap() {

          var canvas = document.createElement('canvas');
          canvas.width = this.width;
          canvas.height = this.height;
          var ctx = canvas.getContext('2d');


          var perlinNoise = new PerlinNoise();

          ctx.fillColor = 'black';
          ctx.fillRect(0, 0, canvas.width, canvas.height);

          var size = 64;

          var i = 0;

          var w = canvas.width/size;
          var h = canvas.height/size;

          for (var x = 0; x < w; x++) {
            for (var y = 0; y < h; y++) {

              var nx = (x*size)/500, ny = (y*size)/500;

              var n = perlinNoise.noise(1 * nx, 1 * ny, .8 );

              var value = Math.round(255 * Math.pow(n, 1.18));

              var color = '#000000';

              if (value < 50) {
                color = 'rgb(0,120,255)';
              } else if (value < 80) {
                color = 'rgb(255,230,153)';
              } else {
                color = 'rgb(102,214,74)';
              }

              ctx.beginPath(),
              ctx.rect(x*size,y*size,size,size);
              ctx.fillStyle = color;
              ctx.fill();

              i++;
            }
          }

          return canvas;

        }

      }

      class PerlinNoise {

        constructor() {
          this.permutation = [ 151,160,137,91,90,15,
          131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
          190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
          88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
          77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
          102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
          135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
          5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
          223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
          129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
          251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
          49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
          138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
          ];
        }

        noise(x, y, z) {
          var p = new Array(512);
          for (var i=0; i < 256 ; i++) {
            p[256+i] = p[i] = this.permutation[i];
          }
          var X = Math.floor(x) & 255,                  // FIND UNIT CUBE THAT
              Y = Math.floor(y) & 255,                  // CONTAINS POINT.
              Z = Math.floor(z) & 255;
          x -= Math.floor(x);                                // FIND RELATIVE X,Y,Z
          y -= Math.floor(y);                                // OF POINT IN CUBE.
          z -= Math.floor(z);
          var u = this.fade(x),                                // COMPUTE FADE CURVES
              v = this.fade(y),                                // FOR EACH OF X,Y,Z.
              w = this.fade(z);
          var A = p[X  ]+Y, AA = p[A]+Z, AB = p[A+1]+Z,      // HASH COORDINATES OF
              B = p[X+1]+Y, BA = p[B]+Z, BB = p[B+1]+Z;      // THE 8 CUBE CORNERS,
          return this.scale(this.lerp(w, this.lerp(v, this.lerp(u, this.grad(p[AA  ], x  , y  , z   ),  // AND ADD
                                         this.grad(p[BA  ], x-1, y  , z   )), // BLENDED
                                 this.lerp(u, this.grad(p[AB  ], x  , y-1, z   ),  // RESULTS
                                         this.grad(p[BB  ], x-1, y-1, z   ))),// FROM  8
                         this.lerp(v, this.lerp(u, this.grad(p[AA+1], x  , y  , z-1 ),  // CORNERS
                                         this.grad(p[BA+1], x-1, y  , z-1 )), // OF CUBE
                                 this.lerp(u, this.grad(p[AB+1], x  , y-1, z-1 ),
                                         this.grad(p[BB+1], x-1, y-1, z-1 )))));
        }

        fade(t) { return t * t * t * (t * (t * 6 - 15) + 10); }
        lerp( t, a, b) { return a + t * (b - a); }
        grad(hash, x, y, z) {
           var h = hash & 15;                      // CONVERT LO 4 BITS OF HASH CODE
           var u = h<8 ? x : y,                 // INTO 12 GRADIENT DIRECTIONS.
                  v = h<4 ? y : h==12||h==14 ? x : z;
           return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v);
        }
        scale(n) { return (1 + n)/2; }


      }

    </script>
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